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Msg response from Bill to me via email:

This is normal behavior. Since alteredCart doesn't have shipping, this button is there to make sure the cart totals are calculated with any taxes when the customer enters their address. I know the '!' makes it look like an error, but it isn't.

This isn't displayed if you charge shipping, since there is a load shipping button, or if you use the option to automatically load shipping when the customer enters their address.

Bill